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UN Markings Guide

It is important to select the correct package for materials that require UN-Rated packaging. The marking that is applied to a UN package indicates the type of package and the levels to which the packaging has been approved. The following describes the sequence of numbers and letters that appear in a UN marking and what they designate.


Combination Packaging or Single Packaging for Solid Hazardous Materials
Example of UN Marking for Solid Hazardous Materials in single or composite packaging or combination packaging for all materials.
UN Markings Guide


Liquid Hazardous Materials
Example of UN Marking for Liquid Hazardous Materials in single or composite packaging.


How to Read UN Markings
Type of
1 - Drums
2 - Barrels
3 - Jerricans
4 - Boxes
5 - Bags
6 - Composite Packagings
A - Steel
B - Aluminum
C - Natural Wood
D - Plywood
F - Reconstituted Wood
G - Fiberboard
H - Plastic
L - Textile
M - Paper, Multiwall
N - Metal other than Steel or Aluminum
P - Glass, Porcelain or Stoneware
1 - Closed Head
2 - Open Head
X - Packing Groups I, II, and III
Y - Packing Groups II and III
Z - Packing Group III only
Maximum Gross Mass or
Specific Gravity
Maximum Gross Mass -
Solids or packagings that have inner packagings must be marked with the maximum gross mass (weight) in kilograms.
Specific Gravity -
Stand alone packagings intended to contain liquids must be marked with the specific gravity rounded down to the first decimal.
Solids or
Inner Packaging
Solids -
An "S" in upper case should follow the maximim gross mass.
Liquids -
Liquids should reflect the Hydrostatic test pressure in kPa (kilopascals), rounded down to the nearest 10 kPa.
Year of
The last two digits of data indicate the year the packaging was manufactured.
Location of
Country where the item was manufactured.
Code for UN certifying agency or manufacturer.